ESX Quantum Q275.1 Zed Audio Built SQ Car Audio MonoBlock Amplifier Old School For Sale

The ESX Quantum Q275.1 is a vintage, highly regarded monoblock car audio amplifier built by Stephen Mantz's Zed Audio around 1997-1998 time frame.Key Specifications

• Power Output (12V): 275 watts RMS at 4 ohms, and 450 watts RMS at 2 ohms.
• Total Harmonic Distortion (THD): 0.05%.
• Damping Factor: 500.
• Fuse Requirement: External 80A.

Design and Reputation

• Build Quality: Built during the golden era of Zed Audio, the ESX Quantum series is famous for being heavily overbuilt, durable, and featuring exceptional sound quality that audiophiles still prize today.
• Circuitry: Features fully regulated pulse width modulated (PWM) power supplies and discrete regulators for low-level preamplifier circuits.
• Design: High-end, analog class-A/B monoblock designed for driving subwoofers or demanding low-frequency setups.
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These Amps were over built tanks ( very heavy ) with huge heatsinks and highly under-rated!! These things deliver incredibly clean power! Amp is in good working condition and in really nice physical shape for it's age. Amp will include a manual that is a reprint but very legible and complete!I accept Paypal and payment methods. Shipping will be FREE in the USA. If you have any questions please feel free to ask. Please check out my other listings on as I will gladly combine shipping on multiple items. Thanks for looking!!!